Self balancing one wheeled electric skateboard

Step 6: Fabrication

Close up view of the go-kart bearing each side. Bearing is clamped between two "bearing carriers" which then bolt to frame. Axle will slide through and be held in place by a grub screw which you can just see to lower right of bearing.
I used a 30mm axle but other sizes exist for karts. Make sure your sprocket carrier, wheel mounting, bearings etc are all correct for your chosen axle size before you buy them!